Sections are portions of code or data that cannot be split into smaller elements. Each section has a name, a type, and some attributes.
Each assembly source file contains at least one section. The number of sections in an assembly source file is only limited by the amount of memory available on the system at assembly time. If several sections with the same name are detected inside of a single source file, the code is concatenated into one large section.
Sections from different modules, but with the same name, will be combined into a single section at linking time.
Sections are defined through Section attributes and Section types. The last part of the chapter deals with the merits of using relocatable sections (for more information, refer to the topic Relocatable vs. absolute sections).